* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #f5f5f5;
}
ul {
  list-style: none;
}
img {
  display: block;
  width: 100%;
}
.main {
  width: 1200px;
  margin: 0 auto;
}